A comparison of American direct-current switchboard voltmeters and ammeters (1911)
National Bureau of Standards · leaf 26
actice also. The most decideddeparture from type is in the use of the single air gap in thecase of the instruments of one maker. Evidently further improvements in direct-current switchboardinstruments are to be looked for mainly in the refinement ofdetails of design and construction. We are…
Measurements and use of instruments · electrical engineering/ B8000 Power systems and applications
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